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Has this been your bike for a while ? Have you used it before ?
I had the same issue with a bike I picked up for spares. I decided to fix it up once I had taken the parts I needed. The idle with slow return was caused by a previous owner that had put one of the carbs back together incorrectly, such that the needle was just floating around in the slide. It would rev up & take a random amount of time to come back down to idle. Worked great when I put the needle back in how it should be.
The idle should be at 1500rpm +/- 100 rpm. 1000rpm is to low. Idle RPM should be set with an engine at normal running temperature, not cold.
If you have an air leak, then any fluid around th3 boots will seal the hole or at least cause a reaction. Check the fast idle (choke) returns to off position & that the throttle cables & carb connection return to idle position on the idle screw every time.
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